Represents information related to agreements.

No definition available.

Name:	amgp_Agreements
Namespace Prefix:	amgp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the minimum volume commitments that require Antero to utilize or pay certain percentage of the capacity of such new construction of compressor stations.

+ References

No definition available.

+ Details

Name:	amgp_GatheringAndCompressionAgreementMinimumVolumeCommitmentThatRequireAnteroToPayForCompressorStations
Namespace Prefix:	amgp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the minimum volume commitments that require Antero to utilize or pay certain percentage of the capacity of such new construction for high pressure lines.

+ References

No definition available.

+ Details

Name:	amgp_GatheringAndCompressionAgreementMinimumVolumeCommitmentThatRequireAnteroToPayForHighPressureLines
Namespace Prefix:	amgp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The period prior to which notice to be served for the termination of the contract.

+ References

No definition available.

+ Details

Name:	amgp_MinimumNoticePeriodForTerminationOfContract
Namespace Prefix:	amgp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of minimum volume commitments and other fees.

+ References

No definition available.

+ Details

Name:	amgp_MinimumVolumeCommitmentsAndOtherFees
Namespace Prefix:	amgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Term of construction.

+ References

No definition available.

+ Details

Name:	amgp_TermOfConstruction
Namespace Prefix:	amgp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents percentage of third party out of pocket cost reimbursement.

+ References

No definition available.

+ Details

Name:	amgp_ThirdPartyOutOfPocketCostsReimbursementPercentage
Namespace Prefix:	amgp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919359-209981

+ Details

Name:	us-gaap_LessorOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_TypeOfArrangementAxis=amgp_GatheringAndCompressionAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=amgp_WaterServicesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Revenue (Details) - USD ($) $ in Millions			12 Months Ended
Revenue (Details) - USD ($) $ in Millions	Jan. 01, 2020	Nov. 10, 2014	Dec. 31, 2019
Agreements
Third party out of pocket costs reimbursement (as a percent)			3.00%
Minimum volume commitment that require Antero to pay for high pressure lines			75.00%
Minimum volume commitment that require Antero to pay for compressor stations			70.00%
Term of new construction			10 years
Gathering And Compression Agreement
Agreements
Notice period		180 days
Water Services Agreement
Agreements
Agreement term			20 years
Notice period			180 days
Third party out of pocket costs reimbursement (as a percent)			3.00%
Minimum volume commitments	$ 0